Spanish league leaders Barcelona head in to the clash with a commanding lead, having beaten the Gunners in North London 2-0 thanks to a double from the mercurial Lionel Messi.
Not many are giving Arsenal a hope of turning the tie around, not least when you consider the La Liga giants are currently presiding over a club record 37-game unbeaten run in all competitions.
Iniesta, however, isn’t taking the challenge lightly and feels his side will have to monitor former teammate Alexis Sanchez carefully as the Chilean has the ability to make an impact.
“Arsenal have a big squad but, because of his history with Barcelona, Alexis is the key man we have to look out for,” Iniesta explained.
“He’s a big footballer and showed his level when he played for Barca. But it’s not easy at this club to be first-choice striker. He has a lot of quality and can create problems.”
After leaving Barcelona for Arsenal, Sanchez reached a whole new level altogether as he seemingly thrived on being the club’s outstanding player, scoring and assisting an abundance of goals with 29 goals and 15 assists in total.
However, his form this season has dropped somewhat ,with his second-half equaliser in the North London derby at Tottenham Hotspur last weekend being his first Premier League goal since October.
Barca will be well aware of the 27-year-old’s threats at the Nou Camp this coming week, though it would take a truly special performance to make the sort of impact which would see Arsenal go through.